// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @fileoverview New tab page 4
 * This is the main code for a previous version of the Chrome NTP ("NTP4").
 * Some parts of this are still used for the chrome://apps page.
 */

// Use an anonymous function to enable strict mode just for this file (which
// will be concatenated with other files when embedded in Chrome
cr.define('ntp', function() {
  'use strict';

  /**
   * NewTabView instance.
   * @type {!Object|undefined}
   */
  let newTabView;

  /**
   * If non-null, an bubble confirming that the user has signed into sync. It
   * points at the login status at the top of the page.
   * @type {!cr.ui.Bubble|undefined}
   */
  let loginBubble;

  /**
   * true if |loginBubble| should be shown.
   * @type {boolean}
   */
  let shouldShowLoginBubble = false;

  /**
   * The time when all sections are ready.
   * @type {number|undefined}
   * @private
   */
  let startTime;

  /**
   * The number of sections to wait on.
   * @type {number}
   */
  let sectionsToWaitFor = -1;

  /**
   * The time in milliseconds for most transitions.  This should match what's
   * in new_tab.css.  Unfortunately there's no better way to try to time
   * something to occur until after a transition has completed.
   * @type {number}
   * @const
   */
  const DEFAULT_TRANSITION_TIME = 500;

  /**
   * Creates a NewTabView object. NewTabView extends PageListView with
   * new tab UI specific logics.
   * @constructor
   * @extends {ntp.PageListView}
   */
  function NewTabView() {
    const pageSwitcherStart = /** @type {!ntp.PageSwitcher} */ (
        getRequiredElement('page-switcher-start'));
    const pageSwitcherEnd = /** @type {!ntp.PageSwitcher} */ (
        getRequiredElement('page-switcher-end'));
    this.initialize(
        getRequiredElement('page-list'), getRequiredElement('dot-list'),
        getRequiredElement('card-slider-frame'), getRequiredElement('trash'),
        pageSwitcherStart, pageSwitcherEnd);
  }

  // TODO(dbeam): NewTabView is now the only extender of PageListView; these
  // classes should be merged.
  NewTabView.prototype = {__proto__: ntp.PageListView.prototype};

  /**
   * Invoked at startup once the DOM is available to initialize the app.
   */
  function onLoad() {
    sectionsToWaitFor = 1;
    measureNavDots();

    newTabView = new NewTabView();

    if (!loadTimeData.getBoolean('showWebStoreIcon')) {
      const webStoreIcon = $('chrome-web-store-link');
      // Not all versions of the NTP have a footer, so this may not exist.
      if (webStoreIcon)
        webStoreIcon.hidden = true;
    } else {
      const webStoreLink = loadTimeData.getString('webStoreLink');
      const url =
          appendParam(webStoreLink, 'utm_source', 'chrome-ntp-launcher');
      $('chrome-web-store-link').href = url;
      $('chrome-web-store-link')
          .addEventListener('auxclick', onChromeWebStoreButtonClick);
      $('chrome-web-store-link')
          .addEventListener('click', onChromeWebStoreButtonClick);
    }

    // We need to wait for all the footer menu setup to be completed before
    // we can compute its layout.
    layoutFooter();

    if (loadTimeData.getString('login_status_message')) {
      loginBubble = new cr.ui.Bubble;
      loginBubble.anchorNode = $('login-container');
      loginBubble.arrowLocation = cr.ui.ArrowLocation.TOP_END;
      loginBubble.bubbleAlignment =
          cr.ui.BubbleAlignment.BUBBLE_EDGE_TO_ANCHOR_EDGE;
      loginBubble.deactivateToDismissDelay = 2000;
      loginBubble.closeButtonVisible = false;

      $('login-status-advanced').onclick = function() {
        chrome.send('showAdvancedLoginUI');
      };
      $('login-status-dismiss').onclick = loginBubble.hide.bind(loginBubble);

      const bubbleContent = $('login-status-bubble-contents');
      loginBubble.content = bubbleContent;

      // The anchor node won't be updated until updateLogin is called so don't
      // show the bubble yet.
      shouldShowLoginBubble = true;
    }

    $('login-container').addEventListener('click', showSyncLoginUI);
    if (loadTimeData.getBoolean('shouldShowSyncLogin'))
      chrome.send('initializeSyncLogin');

    doWhenAllSectionsReady(function() {
      // Tell the slider about the pages.
      newTabView.updateSliderCards();
      // Mark the current page.
      newTabView.cardSlider.currentCardValue.navigationDot.classList.add(
          'selected');

      cr.dispatchSimpleEvent(document, 'ntpLoaded', true, true);
      document.documentElement.classList.remove('starting-up');

      startTime = Date.now();
    });
  }

  /**
   * Launches the chrome web store app with the chrome-ntp-launcher
   * source.
   * @param {Event} e The click/auxclick event.
   */
  function onChromeWebStoreButtonClick(e) {
    if (e.button > 1)
      return;  // Ignore buttons other than left and middle.
    chrome.send(
        'recordAppLaunchByURL',
        [encodeURIComponent(this.href), ntp.APP_LAUNCH.NTP_WEBSTORE_FOOTER]);
  }

  /**
   * Queued callbacks which lie in wait for all sections to be ready.
   * @type {Array}
   */
  const readyCallbacks = [];

  /**
   * Fired as each section of pages becomes ready.
   */
  document.addEventListener('sectionready', function(e) {
    if (--sectionsToWaitFor <= 0) {
      while (readyCallbacks.length) {
        readyCallbacks.shift()();
      }
    }
  });

  /**
   * This is used to simulate a fire-once event (i.e. $(document).ready() in
   * jQuery or Y.on('domready') in YUI. If all sections are ready, the callback
   * is fired right away. If all pages are not ready yet, the function is queued
   * for later execution.
   * @param {Function} callback The work to be done when ready.
   */
  function doWhenAllSectionsReady(callback) {
    assert(typeof callback == 'function');
    if (sectionsToWaitFor > 0)
      readyCallbacks.push(callback);
    else
      window.setTimeout(callback, 0);  // Do soon after, but asynchronously.
  }

  /**
   * Measure the width of a nav dot with a given title.
   * @param {string} id The loadTimeData ID of the desired title.
   * @return {number} The width of the nav dot.
   */
  function measureNavDot(id) {
    const measuringDiv = $('fontMeasuringDiv');
    measuringDiv.textContent = loadTimeData.getString(id);
    // The 4 is for border and padding.
    return Math.max(measuringDiv.clientWidth * 1.15 + 4, 80);
  }

  /**
   * Fills in an invisible div with the longest dot title string so that
   * its length may be measured and the nav dots sized accordingly.
   */
  function measureNavDots() {
    const styleElement = document.createElement('style');
    styleElement.type = 'text/css';
    // max-width is used because if we run out of space, the nav dots will be
    // shrunk.
    const pxWidth = measureNavDot('appDefaultPageName');
    styleElement.textContent = '.dot { max-width: ' + pxWidth + 'px; }';
    document.querySelector('head').appendChild(styleElement);
  }

  /**
   * Layout the footer so that the nav dots stay centered.
   */
  function layoutFooter() {
    // We need the image to be loaded.
    const logo = $('logo-img');
    const logoImg = logo.querySelector('img');

    // Only compare the width after the footer image successfully loaded.
    if (!logoImg.complete || logoImg.width === 0) {
      logoImg.onload = layoutFooter;
      return;
    }

    const menu = $('footer-menu-container');
    if (menu.clientWidth > logoImg.width)
      logo.style.WebkitFlex = '0 1 ' + menu.clientWidth + 'px';
    else
      menu.style.WebkitFlex = '0 1 ' + logoImg.width + 'px';
  }

  /**
   * Called when the theme has changed.
   * @param {Object=} opt_themeData Not used; only exists to match equivalent
   *     function in incognito NTP.
   */
  function themeChanged(opt_themeData) {
    $('themecss').href = 'chrome://theme/css/new_tab_theme.css?' + Date.now();
  }

  function setBookmarkBarAttached(attached) {
    document.documentElement.setAttribute('bookmarkbarattached', attached);
  }

  /**
   * Set the dominant color for a node. This will be called in response to
   * getFaviconDominantColor. The node represented by |id| better have a setter
   * for stripeColor.
   * @param {string} id The ID of a node.
   * @param {string} color The color represented as a CSS string.
   */
  function setFaviconDominantColor(id, color) {
    const node = $(id);
    if (node)
      node.stripeColor = color;
  }

  /**
   * Updates the text displayed in the login container. If there is no text then
   * the login container is hidden.
   * @param {string} loginHeader The first line of text.
   * @param {string} loginSubHeader The second line of text.
   * @param {string} iconURL The url for the login status icon. If this is null
        then the login status icon is hidden.
   * @param {boolean} isUserSignedIn Indicates if the user is signed in or not.
   */
  function updateLogin(loginHeader, loginSubHeader, iconURL, isUserSignedIn) {
    /** @const */ const showLogin = loginHeader || loginSubHeader;

    $('login-container').hidden = !showLogin;
    $('login-container').classList.toggle('signed-in', isUserSignedIn);
    $('card-slider-frame').classList.toggle('showing-login-area', !!showLogin);

    if (showLogin) {
      // TODO(dbeam): we should use .textContent instead to mitigate XSS.
      $('login-status-header').innerHTML = loginHeader;
      $('login-status-sub-header').innerHTML = loginSubHeader;

      const headerContainer = $('login-status-header-container');
      headerContainer.classList.toggle('login-status-icon', !!iconURL);
      headerContainer.style.backgroundImage =
          iconURL ? getUrlForCss(iconURL) : 'none';
    }

    if (shouldShowLoginBubble) {
      window.setTimeout(loginBubble.show.bind(loginBubble), 0);
      chrome.send('loginMessageSeen');
      shouldShowLoginBubble = false;
    } else if (loginBubble) {
      loginBubble.reposition();
    }
  }

  /**
   * Show the sync login UI.
   * @param {Event} e The click event.
   */
  function showSyncLoginUI(e) {
    const rect = e.currentTarget.getBoundingClientRect();
    chrome.send(
        'showSyncLoginUI', [rect.left, rect.top, rect.width, rect.height]);
  }

  /**
   * Wrappers to forward the callback to corresponding PageListView member.
   */

  /**
   * Called by chrome when a new app has been added to chrome or has been
   * enabled if previously disabled.
   * @param {Object} appData A data structure full of relevant information for
   *     the app.
   * @param {boolean=} opt_highlight Whether the app about to be added should
   *     be highlighted.
   */
  function appAdded(appData, opt_highlight) {
    newTabView.appAdded(appData, opt_highlight);
  }

  /**
   * Called by chrome when an app has changed positions.
   * @param {Object} appData The data for the app. This contains page and
   *     position indices.
   */
  function appMoved(appData) {
    newTabView.appMoved(appData);
  }

  /**
   * Called by chrome when an existing app has been disabled or
   * removed/uninstalled from chrome.
   * @param {Object} appData A data structure full of relevant information for
   *     the app.
   * @param {boolean} isUninstall True if the app is being uninstalled;
   *     false if the app is being disabled.
   * @param {boolean} fromPage True if the removal was from the current page.
   */
  function appRemoved(appData, isUninstall, fromPage) {
    newTabView.appRemoved(appData, isUninstall, fromPage);
  }

  /**
   * Callback invoked by chrome whenever an app preference changes.
   * @param {Object} data An object with all the data on available
   *     applications.
   */
  function appsPrefChangeCallback(data) {
    newTabView.appsPrefChangedCallback(data);
  }

  /**
   * Callback invoked by chrome whenever the app launcher promo pref changes.
   * @param {boolean} show Identifies if we should show or hide the promo.
   */
  function appLauncherPromoPrefChangeCallback(show) {
    newTabView.appLauncherPromoPrefChangeCallback(show);
  }

  /**
   * Called whenever tiles should be re-arranging themselves out of the way
   * of a moving or insert tile.
   */
  function enterRearrangeMode() {
    newTabView.enterRearrangeMode();
  }

  /**
   * Callback invoked by chrome with the apps available.
   *
   * Note that calls to this function can occur at any time, not just in
   * response to a getApps request. For example, when a user
   * installs/uninstalls an app on another synchronized devices.
   * @param {Object} data An object with all the data on available
   *        applications.
   */
  function getAppsCallback(data) {
    newTabView.getAppsCallback(data);
  }

  /**
   * Return the index of the given apps page.
   * @param {ntp.AppsPage} page The AppsPage we wish to find.
   * @return {number} The index of |page| or -1 if it is not in the collection.
   */
  function getAppsPageIndex(page) {
    return newTabView.getAppsPageIndex(page);
  }

  function getCardSlider() {
    return newTabView.cardSlider;
  }

  /**
   * Invoked whenever some app is released
   */
  function leaveRearrangeMode() {
    newTabView.leaveRearrangeMode();
  }

  /**
   * Save the name of an apps page.
   * Store the apps page name into the preferences store.
   * @param {ntp.AppsPage} appPage The app page for which we wish to save.
   * @param {string} name The name of the page.
   */
  function saveAppPageName(appPage, name) {
    newTabView.saveAppPageName(appPage, name);
  }

  function setAppToBeHighlighted(appId) {
    newTabView.highlightAppId = appId;
  }

  // Return an object with all the exports
  return {
    appAdded: appAdded,
    appMoved: appMoved,
    appRemoved: appRemoved,
    appsPrefChangeCallback: appsPrefChangeCallback,
    appLauncherPromoPrefChangeCallback: appLauncherPromoPrefChangeCallback,
    enterRearrangeMode: enterRearrangeMode,
    getAppsCallback: getAppsCallback,
    getAppsPageIndex: getAppsPageIndex,
    getCardSlider: getCardSlider,
    onLoad: onLoad,
    leaveRearrangeMode: leaveRearrangeMode,
    saveAppPageName: saveAppPageName,
    setAppToBeHighlighted: setAppToBeHighlighted,
    setBookmarkBarAttached: setBookmarkBarAttached,
    setFaviconDominantColor: setFaviconDominantColor,
    themeChanged: themeChanged,
    updateLogin: updateLogin
  };
});

document.addEventListener('DOMContentLoaded', ntp.onLoad);

const toCssPx = cr.ui.toCssPx;